Improvement in grinding edge-tools



\ be given by mealis of a system of levers, at

PATENT OFFICE.

G. O. EATON, OF LOOKPORT, NEW YORK.

IMPROVEMENT IN GR.

INDING since-roots Specification forming part of Letters Patent No. 37,616, dated February 10, 1863.

To aZZ whom, it may concern..-

Be it known that I, G. C. EATON, of Lockport, in the county of Niagara and State of New York, have invented new and useful Ilii-y provements in Grinding Apparatus for Edge Tools; and I do hereby declare that the following is a full and complete description of the construction and operation of the same, reference being had to the accompanying drawings, makiilg part of this specification, in which- Y Fgurel is a top View, and Fig. 2 is a side view.

' Like letters referto like parts.

The nature of my invention relates to an apparatus for holding the tool .upon a grindstone, whereby a greater or less pressure can the pleasure of the operator, said levers being adjustable for that purpose; also, in the adjustment of the apparatus for differentsized stones, io compensate for the changes ilicidelit to'wearing away ot" the stone,` and to the adjustment for different thicknesses ot' tools.

A represents a post which stands upon or is-attached to a movable platform, so that it can be moved nearer to the stone as the'stone wears away. In this post is a slot, B B', as indicated by the dotted lilies, through which the hinge-bolts c c pass, so that the statiolr ary part of thev hinge D can be moved uit and down on the' post to accommodate the height of the stone.

E represents an arni hinged to D by the pin D,tlius allowing the arm to swing around in a horizontal direction, as indicated by the lilies F F in Fig. l. The arm E is slotted from e to c. the angle c' being some live or six inches lower than the point e. The iniddle part, E', is vertical, while the outer end, E, is horizontal. At e a beiitlever is attached to the section E". The long arm G of this lever works between the pieces composing Section E, alid has a movement from G to G'. llie long arm of the lever G is slotted, l as seen at H, for purposes presently to be deg scribed. i

I represen ts a lever that has its fulcrum at i t'. The long arm of this lever is also slotted. vl

`as seen at I, and the two slotsy H and lI are' united by a connecting-rod, J, which is adjustable by means of the thumb-,screw J. adjusting this connecting-rod nearer4 to -or farther from the ends of the levers G and l', a greater or less range of motion andrpressure are obtained for the short arm.` he short arm of the lever I carries the seat K, which is provided `with a pin-joint, and is thereby pivoted to the en'd of the lever, as seen at K', and for the purpose of keeping the seatin au upright positionA I attach a stay, L, one end of which is pivoted to the arln E at e and the other end is pivoted to the standard-of the seat K at L. The distance between e and Ll and t' and K being equal, the articulation is free, and during the upward and downward lnovelnent of the seat from K to K the seat K maintains the same relative position. The short arm of the lever Gr turns upward at nearly right angles, as seen at G. alid has a s loket, M, and set-screw M. I N represents un arni, one end of which fits into the socket M, where it is secured at anydesired' point by means of the tliuliib-screw M. The free end ot' this arm extends outward ill a horizontal directioiiand carries ill its end a block,- O,

which presses the tool to the face of the stone, which is represented at P, Figs. l and 2. The arln N can be set at any desired poilit to accommodate the thickness of the tool.

ln grinding, the tool is-plaoed between the block O and the stone P, the operator sitting astride of the seat K, and can Vin that position exert any desired pressure upoll the tool in consequence of the arm G heilig longer than the arln G. .By adjusting the colinectingrod in the slots H and 1 the pressure can be regulated.

What I claim as lny improvement, and de sire to secure by Letters. Patent, is

The adjustingslot B B in the post A, the

hinged arm E, levers G and I, connecting-roll J, stay L, seat K, and slide N, arranged and -opcrated as and for the purpose set forth.

G. C. EATON.-

Witiiesses z A. T. PRENTICE, G. V. Ricos. 

